I get AppleCare+ for every single Apple product I own and especially for Macs, as these are even more expensive to have serviced than most iDevices, which are usually not as expensive to repair/replace, but bad enough when these devices are pretty expensive to purchase.
And as far your iPad Pro is concerned, AppleCare+ would have been far cheaper to purchase than the expensive replacement cost you are facing and stuck with now!
Don’t you think?
You take a risk for years NOT purchasing that extra Apple warranty protection on expensive Apple devices, that odds are, at least once in that span of time, something is going to happen or go wrong to a device or computer that you will not be able to afford to repair or replace yourself early on.
Electronic device accidents and failures, on some level, can and do happen all the time and when you least expect it and, usually, at a bad economic time and circumstance.
These support communities are littered every single day with users who drop their iDevices and laptops all the time that got seriously burned because they hadn't purchase that additional, extended Apple product warranty protection.
It is NOT a matter of IF something will happen to your Apple devices or computers, but WHEN, as you have, unfortunately discovered.
If you can;t afford to replace that iPad Pro and you are now forced to use it as is, I would get some sort of thin plastic film screen protector to keep the remainder of glass protected and in place and keep it from falling out or cracking/shattering even more.
Glass screen protectors are out as many do not work well with the new 2018 iPad Pro models.
Best of Luck to You!